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Financial instruments - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Number of days after consumption billings are considered past due | 45 days
Minimum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Duration certain foreign currencies are fixed to the dollar | 20 years

X
- Definition The number of days after consumption billings are considered past due. + References No definition available. + Details
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Namespace Prefix: | cwco_
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Balance Type: | na
Period Type: | duration

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- Definition The duration certain foreign currencies are fixed to the dollar. + References No definition available. + Details
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Namespace Prefix: | cwco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |